Pneumatic-tire valve



April 17, 192s.

J. P. GlTs PNEUMATIC TIRE VALVE Filed Nov. 14. 1927 lf2 4P Patented Apr. 17, 1928.

UNITED :STAT-Es 'Laissez JULES r. GITs, or cHIcAGo, ILLrNoIs.

PNEUMATICLTIRE VALVE.

' Application led November 14, 19.27. Serial No. 232,991.

My invention relates to .certain new and useful. improvements in valves and more particularly to a type of valve employedin a pneumatic inner tube of ap vehicle tire wherein the valve isheld against its seat by the pressure of air in the tube.

It has been heretoforecustomary to furnish such a valve in *anl inner tube and to rely solely on the air pressure to keep the inner tube should remainat the same pressure indefinitely if the valve remains tightly seated and there are no. leaks. It is common experience, however, toV find lthe air pressure. constantly lowering, indicating that at some point the air is escaping. Suchl escape of the air is the result of the valve kbeing jarred from its seat due to vibration of the vehicle. I am aware' of the Vfact that others have suggested the employement of a positive lock for the valve whereby vto hold the valve locked on its seat. Such suggestions, however, have been found, in practice, to be impractical as they involve the reconstruction of the valve casing,'due

.to the fact that ity is necessary to embody additional mechanism in the valve casing in order to accommodate the locking device.

' The primary object of thisl invention is to provide an improved form of locking mechanism which may be embodied in the vcap of the valve casing whereby thesame may be. adapted tothe standard form of valve casing. According to the teachings of this invention, it is proposed to adapt lthe locking mechanism tothe cap ofthev valve casing so that after the `cap is threaded into position, means may be operated to grip the valve stem so as to hold the valve Vlocked to its seat.

A further object of the invention is to provide a simple, inexpensive and practical form vof locking mechanismy which may be readily adapted to .any standard form of pneumatic tire valve.

arthow to construct and practice my invent-ion, I shall `now describe a preferred embodiment thereof taken in connection` with the accompanying drawings which spring 2() within member 12 normally func- `form a part hereof.

valve seated. Theoretically the air in theA In order to apprise those skilled thel In the drawings:

Figure 1 is ay vertical cross sectional view of a pneumatic tire valve embodying the invention f Fig. 2 is a similar View but illustrating the valve locked to its seat;

Fig. 3 :is a sectional view taken on line of Fig. 1; Fig. 4 is a sectional view taken on line n0 '4 4 of Fig. 2;

vapplicable to any form of valve. "Referring more in detail to the accompanying drawing, I have illustrated a well known type of valve comprsingthe casing 1 having a threaded neck 2'for receiving the usual cap 3. A longitudinal movable valve stemL .4 is disposed in casingv 1 and carries the -usual cushion valve 5 adapted to engage 1l against seat 6V to close the internal passage l of casing 1. A cup A8 is furnished to pro- Avide means wherebythe back pressure of the air in theinner tube willvtend to hold valve 5 seated. A. coil spring 9 is also pro- 80 vided to assist iii holding the `valve seated.

Stem l extends upwardly and vis furnished with a Hared portion 10 which is normally the means by which the valve may be gripped for removing it from casingfl.

I contemplate furnishing an inverted cuplike member 12 adapted for sliding movenient over the upper end of cap 3. A locking pin 13 is secured to the inside of member 12, preferably by a drivefit. Such con- Y lnection may be secured by furnishing a downwardly extending boss 14 into which pin 13 may be tightly driven. This pin has its bottom 15 closed. A transverse slot 16, as shown in Fig. v6, into which theupper `end of valve stem 4 is adapted to pass, is

provided Vin bottom 15. vBottom 15 of lock ing pin 13 isslightly larger in diameter than that ofthe pin itself,.whereby to furnish a flange 17 which functions to hold 10 member 12 positioned on'cap 3. A coil tions to keep member 12 in extended relation with respect to cap 3.

When it is desired to lock valve 5 to its seat 6, cap'3 ,is threaded into position as illustrated in Fig. 1. The operator` then depresses member 12 until the upper end of stein l registers with and enters slot 16. Member 12 is further depressed until the enlarged portion 10 oit valve stem 4 enters locking pin 13 whereupon a slight rotation of member 12 will rotate pin 13 until the enlarged portion" 10 is out of register with slot 16. Continued rotation of locking pin 13 causes abutments 21 on the inside of pin 13 to'engage the enlarged portion 10 of' valve stein Ll. Valve stem 4: being rotatable, it is, therefore, impossible to again bring the valve stem in alignment with slot 16 by a continued rotation of membei' 12. impossible accidentally to i'iee'the locking device herein disclosed by mere rotation of the cap 3 or the member 12.

I contemplate providing slight depressions 23 on the inside of face 'l5 of pin 13 so as to allow the enlarged portion 10 to drop into this depression, which in effect forms a diaiiietricai groove. Such groove tends to prevent the valve stein 4 from slipping into a position where the enlarged portion 10 thereof registers with slot 16.

Coil vspring 20 tends to urge member 12 upwardly so as to positively hold portion 10 within locking pin 13. l find that it is impossible by virtue oic this arrangement 'accidentally to jar the upper end of the valve stem out of locking engagement with locking pin 13.r Obviously, it will be apparent that valve 5 is securely held locked on its seat (i, being releasable only by reverse rotation of member 12 which rotates abutments 21 to move the enlarged portion 10 ot' valve stem 4 in register with transverse slot 1G in the bottom 15 o1 the pin 13. There-y upon, coil spring 2O will act to raise member 12 and locking pin 13 upwardly, as illustrated in Figs. 1 and 5, so as to release the valve stem and allow valve 5 to be depressed to open the valve passage 7 in the event it isdesiied to increase the air pressure in the inner tube.

y casing. lt is merely attached to the cap andv From the foregoing description, it is apparent that the valve locking device may be embodied in the cap without modification or change in construction of the valve or its can be operated by depressing it aft-er the cap has been threaded into position. It functions positively to hold the valve to its sea-t and cannot be jarred tree by vibration. abutment 21 and groove 23 retain the upper end of the valve stem in pin 13 and will release the valve stem only when the member 12 is rotated in one direction only.

' lhereiore, it will be practically mechanism positioned therein,a cap for said casing, and means associated with said 'cap for holding said valve lockedon its seat.l 2. A tire valve comprising a casing, valve mechanism therefor', a cap Jfor said casing, and means for holding said valvelocked on its seat, said means being operable after said cap is positioned on said casing.

3. An air valve comprising a casing, valve mechanism positioned therein, a cap for saidl casing, and 'means disposed in said cap'for holding said valve lockedin .its seat.

4l. A pneumatic tire valve comprising a casing, valve mechanism positioned therein,

and a ca for closin said casino* havin provisions for grip-ping said valve" to holdV itl locked on its seat.

` 5. A pneumatic tire valve comprising" a casing, valve mechanism positioned therein, a cap for said casing, and depressible means operable after said cap is positioned 'for eiigagin'g and gripping said valve to locked on its seat. l

6; A pneumatic tire'valve comprising a casing, a valve stem disposed in said casing,

hold it a cushioned valve carried by said valve ste-m,

a cap for one end of sai-d casing, and vmeans associated with saidv cap for gripping said valve stein whereby to lock it against move-` ment and to` hold said valve .locked on its seat.

" 7. A pneumatic tire valve comprising a casing, a valve stem disposed in said easing,

a cushioned' valve carried by said valve stem,l

a capy for said cas-ing, a locking element ear ried by said cap and movable inwardly to engage the end of said valve stem, 'and spring means for urging said locking .element outwardly whereby to hold said valve locked on its seat- 8. A pneumatic tire valve comprising' a casing, a longitudinally movable valvestem in said casing, a valve carried byV said valve stem', and a locking element whichv is movable along the axis of said valve stem for engaging one end thereof whereby to hold said valve locked on its seat.

9. A pneumatic tire valve comprising a casing' provided with at least one end open, a cap for said open end, valve steinV in said casing, a valve on said valve stein, and

spring pressed locking element on said 'cap therefor, a valve stem in said casing, a 'valve on said stem, a pin slidably carried with respect to said cap, said pin having an opening therein for the receptiony of one end of .said valve stem, 'and means for holding said l0 end of the valve stem in said pin opening Wherebyrto hold said valve locked to its seat.

'In Witness whereof, I have hereunto subscribed my name.

JULES P. GITS. 

